Describe here your question/suggestion/issue (expected and actual results): I want to know how to backup and restore a Drupal site in Bitnami Drupal 8 VM on Mac OS X

Steps to reproduce the issue (if relevant):

I signed in Drupal 8 from the browser and put on the "Maintenance mode"

I compressed the folder "htdocs" on the path "bitnami/apps/drupal/"

I copied the file htdocs.zip to my Mac files system

I exported the database bitnami_drupal8 from phpMyAdmin in the file "bitnami_drupal8.sql"

I mounted /opt/bitnami from the window of Drupal

I tried to erase all files in folder "htdocs" (because I want to replace with other "htdocs" folder). Some files were erased, but then I received this message in emergent window "It is imposible complete the operation, because you don't have the permission for accessing some elements". I attached the image.